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[The Evolutionary Mystery of Milk: Why Some Humans Can Drink It and Others Can't]-[Lacking Lactose: How Just A Glass Can Give Us Gas! (11/7/22)]

Wow in the World · B1 · 2022-11-07

Preschool Enlightenment
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📋 Summary

The Science of Lactose: An Evolutionary Journey

In this episode of Wow in the World, hosts Mindy Thomas and Guy Raz embark on a whimsical yet educational journey to the "Milk Museum" to explore the fascinating evolutionary history of human milk consumption. Through the comedic lens of their character Thomas Fingerling—who suffers from chronic flatulence after consuming a gallon of milk—the show unpacks the biological reality of lactose intolerance.

The Biological Mechanism: Lactase and Lactose

The hosts explain that the digestive trouble experienced by Fingerling is a classic case of "lactose intolerance." The science is straightforward: most dairy products contain a sugar known as "lactose." To process this sugar, the human gut requires a "worker molecule" or enzyme called "lactase." When an individual lacks sufficient lactase, their body cannot break down the lactose, leading to common side effects such as "flatulence."

Evolutionary Adaptation: Survival of the Digestors

The episode highlights a groundbreaking scientific theory regarding human evolution. While humans did not always possess the ability to digest cow's milk, they developed this trait over thousands of years. The narrative, presented via an immersive animatronic exhibit, suggests that approximately 6,000 years ago, humans began consuming cow's milk. However, without the lactase enzyme, this consumption caused widespread digestive distress.

The turning point, according to research published in the journal Nature, occurred during periods of famine. In times when food sources were scarce, cow's milk became a "last resource for survival." Those individuals who had evolved the ability to produce lactase could derive nutrition from milk and survive, while those who could not often perished. Consequently, these "lactose-tolerant ancestors" passed their beneficial genes down through generations, eventually leading to the modern human population, where approximately 65% of humans still struggle with lactose digestion while others have adapted.

Modern Solutions and Conclusions

As the hosts navigate the museum's gift shop, they reflect on the variety of modern alternatives for those who remain lactose intolerant, including almond, soy, and oat milks. For those who refuse to give up dairy, the show humorously suggests "charcoal filter" underpants as a practical solution to the social implications of digestion issues.

Ultimately, the episode serves as a reminder that our modern dietary habits are the result of thousands of years of biological adaptation. By blending humor with scientific research, Wow in the World illustrates how human survival—and our ability to enjoy a glass of milk—is deeply rooted in our evolutionary past.

🎯Key Sentences

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I wanted to see what all the fuss was about.
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I don't trust liquids I can't see through.
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I'm with you so far.
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What are you all fussing about?
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I'm feeling fine and dandy, thank you very much.
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📝Key Phrases

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music to your ears
2
get on with the show
3
try out
4
get in the mood
5
crack a window
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📖 Transcript

Grownups, Wondery Plus subscribers can listen to Wow in the World early and ad-free right now.
Join Wondery Plus in the Wondery app or Wondery Kids Plus on Apple Podcasts.
Hey, Wowzer fans, Mindy here.
And before we start the show, I gotta let you know that this November, with a special new episode featuring our friends at Circle Round and Terrestrials on Radiolab for Kids,
And don't miss when Elmo from Sesame Street stops by Wow in the World to make us all belly laugh on November 24th.
Oh, but that's not all, Reg.

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